Worm lions

Definition

The predatory, fossorial larvae of dipteran flies in the family Vermileonidae (order Diptera). These larvae construct conical pit traps in loose, dry soil or sand—similar to antlion pits—and wait buried at the bottom with only their head exposed to capture small arthropods that fall in. Unlike true antlions (Myrmeleontidae, order Neuroptera), worm lions are flies; their pits are typically smaller and constructed in finer substrates.

Etymology

From 'worm' (larval form) and 'lion' (alluding to the predatory pit-trap behavior shared with antlions)

Example

In arid Mediterranean habitats, worm lion larvae of Lampromyia species excavate pits 1–2 cm across in sandy roadside banks, feeding primarily on small ants and springtails that tumble into the funnel.

Synonyms

• vermileonid larvae

Related Terms

• Antlions
• pit trap
• Fossorial
• Vermileonidae
• Myrmeleontidae
• ambush predator

Usage Notes

Strictly refers to vermileonid larvae, not adults. The common name emphasizes behavioral convergence with antlions, but the two groups are phylogenetically distant (Diptera vs. Neuroptera). Specialist literature often prefers 'vermileonid larvae' to avoid confusion. Pit size and substrate preference help distinguish worm lion pits from those of true antlions in the field.